Maxim Integrated DS4830A Optical Microcontroller - Manual (Page 78)

DS4830A User’s Guide
78
QTDATA Register map when RW_LST = 0 (in the QTCN Register)
Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Name - LOW or HIGH THRESHOLD
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Access r r r r r r rw rw rw rw rw rw rw rw rw rw
BIT
NAME DESCRIPTION
15:10 - Reserved. The user should write these bits to ‘0’.
9:0 QTDATA[9:0] a. Low Threshold Configuration (When the LTHT bit in the QTCN register is set to ‘0’)
The QTDATA register selects low threshold register addressed by QTIDX[3:0] bits in
the QTCN register for read and write operation. The low threshold registers are 10-bit
wide and the upper QTDATA [15:10] bits are ignored and return 0.
b. High Threshold Configuration (When the LTHT bit in the QTCN register is set to ‘1’)
The QTDATA selects high threshold register addressed by QTIDX[3:0] bits in the
QTCN register for read and write operation. The high threshold registers are 10-bit
wide and upper QTDATA [15:10] bits are ignored and return 0.
QTDATA Register map when RW_LST = 1 (in the QTCN Register)
Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Name - - - - - - - - - - - DIFF CHSEL[3:0]
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Access r r r r r r r r r r r rw rw rw rw rw
BIT
NAME DESCRIPTION
15:5 - Reserved. The user should write these bits to ‘0’.
4 DIFF Mode Selection (DIFF ): This bit selects the Quick trip input channel source either as
single-ended or differential mode. When this bit is set to ‘0’, quick trip channel
(addressed by CHSEL[3:0]) is selected as “single-ended” input. When this bit is set to
‘1’, quick trip channel (addressed by CHSEL[3:0]) is selected as “Differential Mode”
input. See the below table for various quick trip input channel configuration in single-
ended as well as differential mode.
3:0 CHSEL [3:0] QT Channel Select (CHSEL [3:0]): These bits select the Quick trip input channel
source for the quick trip list configuration.
CHSEL[3:0] DIFF = 0
Channel Selected
Single-Ended
DIFF = 1
Channel Selected
Differential Mode
0000 ADC-S0 ADC-D0P – ADC-D0N
0001 ADC-S1 ADC-D1P – ADC-D1N
0010 ADC-S2 ADC-D2P – ADC-D2N
0011 ADC-S3 ADC-D3P – ADC-D3N
0100 ADC-S4 ADC-D4P – ADC-D4N
0101 ADC-S5 ADC-D5P – ADC-D5N
0110 ADC-S6 ADC-D6P – ADC-D6N
0111 ADC-S7 ADC-D7P – ADC-D7N
1000 ADC-S8 NOT VALID
1001 ADC-S9 NOT VALID
1010 ADC-S10 NOT VALID
1011 ADC-S11 NOT VALID
1100 ADC-S12 NOT VALID
1101 ADC-S13 NOT VALID
1110 ADC-S14 NOT VALID
1111 ADC-S15 NOT VALID